Originally Posted by anthony_de
I tried it but it still doesn't work
First check to make sure you have the nvidia drivers installed, if not then:
yum --enablerepo=livna install kmod-nvidia
then make sure that the Driver "nvidia"
is present in your /etc/X11/xorg.conf file
Then reboot or restart your Xserver and see if things have changed.
If not have a look at your /var/log/Xorg.0.log for errors and or warnings that may provide some clues.